Synergistically acting herbicidal mixtures

ABSTRACT

A synergistic herbicidal mixture comprising 
 
A) at least one 3-heterocyclyl-substituted benzoyl derivative of the formula I  
                 
in which the variables have the following meanings: 
         R 1 , R 3  are halogen, alkyl, haloalkyl, alkoxy, haloalkoxy, alkylthio, alkylsulfinyl or alkylsulfonyl;    R 2  is a optionally substituted heterocyclic radical selected from the group: isoxazol-3-yl, isoxazol-4-yl, isoxazol-5-yl, 4,5-dihydroisoxazol-3-yl, 4,5-dihydroisoxazol-4-yl and 4,5-dihydroisoxazol-5-yl;    R 4  is hydrogen, halogen or alkyl;    R 5  is alkyl;    R 6  is hydrogen or alkyl; or one of its environmentally compatible salts; and 
 
B) a synergistically effective amount of the compound of formula II  
                 
or one of its environmentally compatible salts; and, if desired, C) at least one further herbicidal compound; and, if desired, D) at least a safener. Compositions comprising these mixtures, processes for the preparation of these compositions, and their use for controlling undesired plants.

The present invention relates to a synergistic herbicidal mixture comprising

-   A) at least one 3-heterocyclyl-substituted benzoyl derivative of the     formula I     -   in which the variables have the following meanings:     -   R¹, R³ are halogen, C₁-C₆-alkyl, C₁-C₆-haloalkyl, C₁-C₆-alkoxy,         C₁-C₆-haloalkoxy, C₁-C₆-alkylthio, C₁-C₆-alkylsulfinyl or         C₁-C₆-alkylsulfonyl;     -   R² is a heterocyclic radical selected from the group:         isoxazol-3-yl, isoxazol-4-yl, isoxazol-5-yl,         4,5-dihydroisoxazol-3-yl, 4,5-dihydroisoxazol-4-yl and         4,5-dihydroisoxazol-5-yl, it being possible for the six radicals         mentioned to be unsubstituted or mono- or polysubstituted by         halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₄-haloalkyl,         C₁-C₄-haloalkoxy or C₁-C₄-alkylthio;     -   R⁴ is hydrogen, halogen or C₁-C₆-alkyl;     -   R⁵ is C₁-C₆-alkyl;     -   R⁶ is hydrogen or C₁-C₆-alkyl;     -   or one of its environmentally compatible salts;         and -   B) a synergistically effective amount of the compound of formula II     -   or one of its environmentally compatible salts;         and, if desired, -   C) at least one herbicidal compound from the group of the acetyl-CoA     carboxylase inhibitors (ACC), acetolactate synthase inhibitors     (ALS), amides, auxin herbicides, auxin transport inhibitors,     carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate     synthase inhibitors (EPSPS)—, glutamine synthetase inhibitors, lipid     biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX     oxidase inhibitors, photosynthesis inhibitors, synergists, growth     substances, cell wall biosynthesis inhibitors and a variety of other     herbicides;     and, if desired, -   D) a safening effective amount of at least one safener selected from     the group of isoxadifen, mefenpyr and fenchlorazol;     -   or one of its environmentally compatible salts or esters.

The invention furthermore relates to herbicidal compositions comprising a herbicidally active amount of a synergistic herbicidal mixture as defined above and at least one liquid and/or solid carrier and, if desired, at least one surfactant.

Moreover, the invention relates to processes for the preparation of these compositions and to a method of controlling undesirable vegetation.

In crop protection products, it is always desirable to increase the specific activity of an active ingredient and the reliability of action. It is an object of the present invention to increase the activity and/or selectivity of the herbicidally active 3-heterocyclyl-substituted benzoyl derivatives of the formula I against undesirable harmful plants.

We have found that this object is achieved by the mixtures defined at the outset. We have furthermore found herbicidal compositions which comprise these mixtures, processes for their preparation, and methods of controlling undesirable vegetation. In the last-mentioned cases, it is irrelevant whether the herbicidally active compounds of the components A), B) and, if desired, C) and, if desired, D) are formulated and applied jointly or separately and in which sequence they are applied in the case of separate application.

The mixtures according to the invention show a synergistic effect; the compatibility of the herbicidally active compounds of components A), B) and, if desired, C) for certain crop plants is generally retained.

Suitable components C are, as acetyl-CoA carboxylase inhibitors (ACC), for example, cyclohexenone oxime ethers, phenoxyphenoxy-propionic esters or arylaminopropionic acids. The acetolactate synthase inhibitors (ALS) include, inter alia, imidazolinones, pyrimidyl ethers, sulfonamides or sulfonyl ureas. Relevant auxin herbicides are, inter alia, pyridine carboxylic-acids, 2,4-D or benazolin. Lipid biosynthesis inhibitors which are used are, inter alia, anilides, chloroacetanilides, thioureas, benfuresate or perfluidone. Suitable mitosis inhibitors are, inter alia, carbamates, dinitroanilines, pyridines, butamifos, chlorthal-dimethyl (DCPA) or maleic hydrazide. Examples of protoporphyrinogen IX oxidase inhibitors are, inter alia, diphenyl ethers, oxadiazoles, cyclic imides or pyrazoles. Suitable photosynthesis inhibitors are, inter alia, propanil, pyridate, pyridafol, benzothiadiazinones, dinitrophenols, dipyridylenes, ureas, phenols, chloridazon, triazine, triazinone, uracils or biscarbamates. The synergists are, inter alia, oxiranes. Examples of suitable growth substances are aryloxyalkanoic acids, benzoic acids or quinolinecarboxylic acids. The group “various other herbicide” is to be understood as meaning, inter alia, the classes of the active ingredients dicloropropionic acids, dihydrobenzofurans, phenylacetic acids and individual herbicides mentioned below whose mechanism of action is not (fully) understood.

Other suitable components C are active compounds selected from the group of the amides, auxin transport inhibitors, carotenoic biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors and cell wall synthesis inhibitors.

Examples of herbicides which can be used in combination with the 3-heterocyclyl-substituted benzoyl derivatives of formula I and the compound of formula II according to the present invention are, inter alia:

C1 acetyl-CoA carboxylase inhibitors (ACC), for example

-   -   cyclohexenone oxime ethers, such as alloxydim, clethodim,         cloproxydim, cycloxydim, sethoxydim, tralkoxydim, butroxydim,         clefoxydim or tepraloxydim;     -   phenoxyphenoxypropionic esters, such as clodinafop-propargyl         (and, if appropriate, cloquintocet), cyhalofop-butyl,         diclofop-methyl, fenoxaprop-ethyl, fenoxaprop-P-ethyl,         fenthiapropethyl, fluazifop-butyl, fluazifop-P-butyl,         haloxyfop-ethoxyethyl, haloxyfop-methyl, haloxyfop-P-methyl,         isoxapyrifop, propaquizafop, quizalofop-ethyl,         quizalofop-P-ethyl or quizalofop-tefuryl; or     -   arylaminopropionic acids, such as flamprop-methyl or         flamprop-isopropyl;         C2 acetolactate synthase inhibitors (ALS), for example     -   imidazolinones, such as imazapyr, imazaquin,         imazamethabenz-methyl (imazame), imazamoc, imazapic, imazethapyr         or imazamethapyr;     -   pyrimidyl ethers, such as pyrithiobac-acid, pyrithiobac-sodium,         bispyribac-sodium, K1H-6127 or pyribenzoxym;     -   sulfonamides, such as florasulam, flumetsulam or metosulam; or     -   sulfonylureas, such as amidosulfuron, azimsulfuron,         bensulfuron-methyl, chlorimuron-ethyl, chlorsulfuron,         cinosulfuron, cyclosulfamuron, ethametsulfuron-methyl,         ethoxysulfuron, flazasulfuron, halosulfuron-methyl,         imazosulfuron, metsulfuron-methyl, nicosulfuron,         primisulfuron-methyl, prosulfuron, pyrazosulfuron-ethyl,         rimsulfuron, sulfometuron-methyl, thifensulfuron-methyl,         triasulfuron, tribenuron-methyl, triflusulfuron-methyl,         N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]amino]carbonyl]-2-(trifluoro-methyl)-benzenesulfonamide,         sulfosulfuron or iodosulfuron;         C3 amides, for example     -   allidochlor (CDAA), benzoylprop-ethyl, bromobutide,         chlorthiamid, diphenamid, etobenzanid (benzchlomet),         fluthiamide, fosamin or monalide;         C4 auxin herbicides, for example     -   pyridinecarboxylic acids, such as clopyralid or picloram; or     -   2,4-D or benazolin;         C5 auxin transport inhibitors, for example     -   naptalame or diflufenzopyr;         C6 carotenoid biosynthesis inhibitors, for example     -   benzofenap, clomazone (dimethazone), diflufenican,         fluorochloridone, fluridone, pyrazolynate, pyrazoxyfen,         isoxaflutole, isoxachlortole, mesotrione, sulcotrione         (chlormesulone), ketospiradox, flurtamone, norflurazon or         amitrol;         C7 enolpyruvylshikimate-3-phosphate synthase inhibitors (EPSPS),         for example     -   glyphosate or sulfosate;         C8 glutamine synthetase inhibitors, for example     -   bilanafos (bialaphos) or glufosinate-ammonium;         C9 lipid biosynthesis inhibitors, for example     -   anilides, such as anilofos or mefenacet;     -   chloroacetanilides, such as dimethenamid, S-dimethenamid,         acetochlor, alachlor, butachlor, butenachlor, diethatyl-ethyl,         dimethachlor, metazachlor, metolachlor, S-metolachlor,         pretilachlor, propachlor, prynachlor, terbuchlor, thenylchlor or         xylachlor;     -   thioureas, such as butylate, cycloate, di-allate, dimepiperate,         EPTC, esprocarb, molinate, pebulate, prosulfocarb, thiobencarb         (benthiocarb), tri-allate or vernolate; or     -   benfuresate or perfluidone;         C10 mitosis inhibitors, for example     -   carbamates, such as asulam, carbetamid, chlorpropham, orbencarb,         pronamid (propyzamid), propham or tiocarbazil;     -   dinitroanilines, such as benefin, butralin, dinitramin,     -   ethalfluralin, fluchloralin, oryzalin, pendimethalin, prodiamine         or trifluralin;

pyridines, such as dithiopyr or thiazopyr; or

-   -   butamifos, chlorthal-dimethyl (DCPA) or maleic hydrazide;         C11 protoporphyrinogen IX oxidase inhibitors, for example     -   diphenyl ethers, such as acifluorfen, acifluorfen-sodium,         aclonifen, bifenox, chlornitrofen (CNP), ethoxyfen, fluorodifen,         fluoroglycofen-ethyl, fomesafen, furyloxyfen, lactofen,         nitrofen, nitrofluorfen or oxyfluorfen;     -   oxadiazoles, such as oxadiargyl or oxadiazon;     -   cyclic imides, such as azafenidin, butafenacil,         carfentrazone-ethyl, cinidon-ethyl, flumiclorac-pentyl,         flumioxazin, flumipropyn, flupropacil, fluthiacet-methyl,         sulfentrazone or thidiazimin; or     -   pyrazoles, such as ET-751, JV 485 or nipyraclofen;         C12 photosynthesis inhibitors, for example     -   propanil, pyridate or pyridafol;     -   benzothiadiazinones, such as bentazone;     -   dinitrophenols, for example bromofenoxim, dinoseb,         dinoseb-acetate, dinoterb or DNOC;     -   dipyridylenes, such as cyperquat-chloride,         difenzoquat-methylsulfate, diquat or paraquatt-dichloride;     -   ureas, such as chlorbromuron, chlorotoluron, difenoxuron,         dimefuron, diuron, ethidimuron, fenuron, fluometuron,         isoproturon, isouron, linuron, methabenzthiazuron, methazole,         metobenzuron, metoxuron, monolinuron, neburon, siduron or         tebuthiuron;     -   phenols, such as bromoxynil or ioxynil;     -   chloridazon;     -   triazines, such as ametryn, atrazine, cyanazine, desmetryn,         dimethamethryn, hexazinone, prometon, prometryn, propazine,         simazine, simetryn, terbumeton, terbutryn, terbutylazine or         trietazine;     -   triazinones, such as metamitron or metribuzin;     -   uracils, such as bromacil, lenacil, or terbacil; or     -   biscarbamates, such as desmedipham or phenmedipham;         C13 synergists, for example     -   oxiranes, such as tridiphane;         C14 growth substances, for example     -   aryloxyalkanoic acids, such as 2,4-DB, clomeprop, dichlorprop,         dichlorprop-P (2,4-DP-P), fluoroxypyr, MCPA, MCPB, mecoprop,         mecoprop-P or triclopyr;     -   benzoic acids, such as chloramben or dicamba; or     -   quinolinecarboxylic acids, such as quinclorac or quinmerac;         C15 cell wall synthesis inhibitors, for example     -   isoxaben or dichlobenil;         C16 various other herbicides, for example     -   dichloropropionic acids, such as dalapon;     -   dihydrobenzofurans, such as ethofumesate;     -   phenylacetic acids, such as chlorfenac (fenac); or     -   aziprotryn, barban, bensulide, benzthiazuron, benzo-fluor,         buminafos, buthidazole, buturon, cafenstrole, chlorbufam,         chlorfenprop-methyl, chloroxuron, cin-methylin, cumyluron,         cycluron, cyprazine, cyprazole, dibenzyluron, dipropetryn,         dymron, eglinazin-ethyl, endothall, ethiozin, flucabazone,         fluorbentranil, flupoxam, isocarbamid, isopropalin, karbutilate,         mefluidide, monuron, napropamide, napropanilide, nitralin,         oxaciclomefone, phenisopham, piperophos, procyazine,         profluralin, pyributicarb, secbumeton, suifallate (CDEC),         terbucarb, triaziflam, triazofenamid or trimeturon;

or their environmentally compatible salts.

The 3-heterocyclyl-substituted benzoyl derivatives of the formula I are disclosed in WO 96/26206, WO 97/41116, WO 97/41117 and WO 97/41118, WO 98/31681.

The compound of formula II (common name foramsulfuron) is disclosed in U.S. Pat. No. 5,922,646.

The herbicidally active compounds from amongst groups C1 to C16 are described, for example, in

-   -   “Herbizide [Herbicides]”, Hock, Fedtke, Schmidt, 1st edition,         Thieme 1995 (s. “quinclorac” p. 238, “molinat” p. 32,         “butachlor” p. 32, “pretilachlor” p. 32, “dithiopyr” p. 32,         “mefenacet” p. 32, “fenoxapropethyl” p. 216, “dimepiperate” p.         32, “pyrazolynate” p. 146, “pyrazoxyfen” p. 146,         “bensulfuronmethyl” p. 31, “pyrazosulfuron-ethyl” p. 31,         “cinosulfuron” p. 31, “benfuresate” p. 233, “bromobutide”p. 243,         “dymron” p. 243, “dimethyametryn” p. 118, “esprocarb” p. 229,         “pyributicarb” p. 32, “cinemthylin” p. 32, “propanil” p. 32,         “2,4-D” p. 30, “bentazon” p. 30, “azimsulfuron (DPX-A-8947)” p         175, “mecoprop-P” p. 237, “chlorpropham” p. 205, “ethoxyfen” p.         30, “haloxyfop-P-methyl” p. 38, “haloxyfop-ethoxyethyl” p. 38,         “flumiclorac-pentyl” p. 35, “flupropacil” p. 143,         “nipyraclofen” p. 145, “metosulam” p. 33,         “ethametsulfuron-methyl” p. 36, “thifensulfuron-methyl” p. 35,         “pyrithiobac acid” p. 181);     -   “Agricultural Chemicals”, Book II Herbicides, 1993 (s.         “thiobencarb” p. 85, “benzofenap” p. 221, “napropanilid” p. 49,         “piperophos” p. 102, “anilofos” p. 241, “imazosulfuron         (TH-913)” p. 150, “etobenzamid (HW-52)” p. 54, “sulcotrione         (ICIA-0051)” p. 268, “poast” p. 253, “focus” p. 222,         “dimethenamid” p. 48, “sulfosate” p. 236, “2,4-DB” p. 10,         “dichlorprop-P” p. 6, “flupoxam” p. 44, “prosulfocarb” p. 84,         “quinmerac” p. 233, “metazachlor” p. 64, “flurtamone” p. 265,         “bromofenoxim” p. 228, “fomesafen” p. 248,         “imazamethabenz-methyl” p. 153, “clodinafop-propargyl” p. 214,         “fenoxaprop-P-ethyl” p. 208, “fluazifop-P-butyl” p. 207,         “quizalofop-P-ethyl” p. 210, “quizalofop-terfuryl” p. 211,         “flumioxazin” p. 43, “flumipropyn” p. 267, “sulfentrazone” p.         261, “thiazopyr” p. 226, “pyrithiobac-sodium” p. 266,         “flumetsulam” p. 227, “amidosulfuron” p. 151,         “halosulfuron-methyl” p. 148, “rimsulfuron” p. 138,         “tribenuron-methyl” p. 139, “triflusulfuron-methyl” p. 137,         “primisulfuron-methyl” p. 147);     -   “Agricultural Chemicals”, Book II Herbicides, 13th Edition (s.         “carfenstole” p. 284, “sulfosulfuron” p. 145,         “ethoxy-sulfuron” p. 149, “pyribenzoxym” p. 279,         “diflufenzopyr” p. 90, “ET-751” p. 278, “carfentrazone-ethyl” p.         267, “fluthiacet-methyl” p. 277, “imazapic” p. 160,         “butenachlor” p. 54, “tiocarbazil” p. 84, “fluthiamide” p. 62,         “isoxa-flutole” p. 283, “butroxydim” p. 259,);     -   “Short Review of Herbicides & PGRs 1991, Hodogaya Chemicals (s.         “furyloxyfen” p. 142, “triazofenamid” p. 268, “thenylchlorid         (NSK-850)” p. 52, “cumyluron (JC-940)” p. 90, “pendimethalin         (AC-92553)” p. 58, “buthidazole” p. 88, “cyprazole” p. 38,         “allidochlor” p. 48, “benzoylprop-ethyl” p. 38,         “chlorthiamid” p. 150, “diphenamid” p. 34, “flamprop-methyl” p.         40, “fosamin” p. 232, “isoxaben” p. 42, “monalide” p. 32,         “naptalam” p. 36, “pronamid” p. 34, “bialaphos” p. 234,         “glufosinate-ammonium” p. 234, “glyphosate” p. 232, “amitrol” p.         254, “clomeprop p. 20, “dichlorprop” p. 6, “fenoprop” p. 8,         “fluroxypyr” p. 156, “MCPA” p. 4, “MCPB” p. 8, “mecoprop” p. 6,         “napropamide” p. 16, “triclopyr” p. 154, “chloramben” p. 28,         “dicamba” p. 26, “clomazone” p. 268, “diflufenican” p. 42,         “fluorochloridone” p. 266, “fluridone” p. 156, “asulam” p. 112,         “barban” p. 100, “butylate” p. 106, “carbetamide” p. 36,         “chlorobufam” p. 100, “cycloate” p. 108, “desmedipham” p. 104,         “di-allate” p. 106, “EPTC” p. 108, “orbencarb” p. 112,         “pebulate” p. 106, “phen-isopham” p. 118, “phenmedipham” p. 104,         “propham” p. 100, “sulfallate” p. 110, “terbucarb” p. 102,         “tri-allate” p. 108, “vernolate” p. 108, “acetochlor” p. 48,         “alachlor” p. 46, “diethathyl-ethyl” p. 48, “dimethachlor” p.         50, “metolachlor” p. 46, “propachlor” p. 44, “pyrnachlor” p. 44,         “terbuchlor” p. 48, “xylachlor” p. 52, “alloxydim” p. 260,         “clethodim” p. 270, “cloproxydim” p. 268, “tralkoxydim” p. 270,         “dalapon” p. 212, “ethofumesate” p. 124, “benefin” p. 54,         “butralin” p. 58, “dinitramin” p. 56, “ethalfluralin” p. 60,         “fluchloralin” p. 54, “isopropalin” p. 58, “nitralin” p. 58,         “oryzalin” p. 60, “prodiamine” p. 62, “profluralin” p. 54,         “trifluralin” p. 54, “dinoseb” p. 128, “dinoseb-acetate” p. 128,         “dinoterb” p. 128, “DNOC” p. 126, “acifluorfen-sodium” p. 142,         “aclonifen” p. 146, “bifenox” p. 140, “chlornitrofen” p. 138,         “difenoxuron” p. 76, “fluorodifen” p. 138,         “fluoroglycofen-ethyl” p. 146, “lactofen” p. 144, “nitrofen” p.         136, “nitrofluorfen” p. 140, “oxyfluorfen” p. 140,         “cyperquat-chloride” p. 158, “difenzoquat-methylsulfate” p. 160,         “diquat” p. 158, “paraquat-dichloride” p. 158,         “benzthi-azuron” p. 82, “buturon” p. 66, “chlorbromuron” p. 72,         “chloroxuron” p. 76, “chlorotoluron” p. 74, “cycluron” p. 84,         “dimefuron” p. 88, “diuron” p. 70, “ethidimuron” p. 86,         “fenuron” p. 64, “fluometuron” p. 68, “isoproturon” p. 80,         “isouron” p. 88, “karbutilate” p. 76, “linuron” p. 72,         “methabenzthiazuron” p. 82, “metoxuron” p. 72, “monolinuron” p.         66, “monuron” p. 64, “neburon” p. 72, “siduron” p. 68,         “tebuthiuron” p. 86, “trimeturon” p. 64, “isocarbamid” p. 168,         “imazamethapyr” p. 172, “imazapyr” p. 170, “imaza-quin” p. 170,         “imazethapyr” p. 172, “methazole” p. 162, “oxadiazon” p. 162,         “tridiphane” p. 266, “bromoxynil” p. 148, nioxynil” p. 148,         “diclofop-methyl” p. 16, “fenthiaprop-ethyl” p. 20,         “fluazifop-butyl” p. 18, “haloxyfop-methyl” p. 18,         “isoxapyrifop” p. 22, “propaquizafop” p. 24,         “quizalo-fop-ethyl” p. 20, “chlorfenac” p. 258,         “chlorfenprop-methyl” p. 258, “chloridazong p. 174, “maleic         hydrazide” p. 162, “norflurazon” p. 174, “pyridate” p. 176,         “clopyralid” p. 154, “picloram” p. 154, “chlorimuron-ethyl” p.         92, “chlorsulfuron” p. 92, “flazasulfuron” p. 96,         “metsulfuron-methyl” S.92, “nicosulfuron” p. 96,         “sulfometuron-methyl” p. 92, “tria-sulfuron” p. 94, “ametryn” p.         198, “atrazine” p. 188, “aziprotryne” p. 206, “cyanazine” p.         192, “cyprazine” p. 192, “desmetryne” p. 200, “dipropetryn” p.         202, “eglinazine-ethyl” p. 208, “hexazinone” p. 208,         “procyazine” p. 192, “prometone” p. 196, “prometryn” p. 196,         “propazine” p. 188, “secbumeton” p. 196, “simazine” p. 188,         “simetryn” p. 196, “terbumeton” p. 204, “terbutryn” p. 198,         “terbutylazine” p. 190, “trietazine” p. 188, “ethiozine” p. 210,         “metamitron” p. 206, “metribuzin” p. 202, “bromacil” p. 180,         “lenacil” p. 180, “terbacil” p. 180, “benazolin” p. 262,         “bensulide” p. 228, “benzofluor” p. 266, “butamifos.” p. 228,         “DCPA” p. 28, “dichlobenil” p. 148, “endothal” p. 264,         “mefluidide” p. 306, “perfluidone” p. 260, “terbuchlor” p. 48);     -   “Global Herbicide Directory” First Edition, 1994 (s.         “oxadi-argyl” p. 96);     -   “European Directory of Agrochemical Products” Volume         2-Herbicides” Fourth Edition, (s. “buminafos” p. 255).

Moreover, the compound “DEH-112” is disclosed in European Patent Application EP-A 302 203. The compound “tepraloxydim” is described in DE-A 33 36 140; the compound “cinidon-ethyl” in DE-A 36 03 789 and the compound “fluorbentranil” in EP-A 84 893. Other compounds are known from “Brighton Crop Protection Conference—Weeds—1993” (S. “thidiazimin” p. 29, “AC-322140” p. 41, “KIE-6127” p. 47, “prosulfuron” p. 53, “K1H-2023” p. 61, “metobenzuron” p. 67). The compound “carfenstrole (CH-900)” is mentioned in EP-A 332 133, and the compound N-[[[4-methoxy-6-(trifluoro-methyl)-1,3,5-triazin-2-yl]amino]-carbonyl]-2-(trifluoromethyl-benzenesulfonamide) is described in PCT/EP 96/03996.

The assignment of the active ingredients to the respective mechanisms of action is based on current knowledge. If several mechanisms of action apply to one active ingredient, this substance was only assigned to one mode of action.

The above mentioned safeners (component D) are described, for example, in “Herbizide [Herbicides]” Hock, Fedtke, Schmidt, 1st edition, Thieme 1995 (“fenchlorazol” p. 266), WO 91/07874 (“mefenpyr”) and WO 95/07897 (“isoxadifen”).

The 3-heterocyclyl-substituted benzoyl derivatives of the formula I can exist, or be used, in the form of the pure enantiomers and also as racemates or diastereomer mixtures.

The 3-heterocyclyl-substituted benzoyl derivatives of the formula I and/or the compound of formula II and/or the herbicidally active compounds from amoungs groups C1 to C16 and/or the safeners may also exist in the form of their environmentally compatible salts. Suitable salts are, in general, the salts of those cations, or the acid addition salts of those acids, whose cations, or anions, respectively, do not adversely affect the herbicidal action of the active ingredients.

Suitable cations are, in particular, ions of the alkali metals, preferably lithium, sodium and potassium, of the alkaline earth metals, preferably calcium and magnesium, and of the transition metals, preferably manganese, copper, zinc and iron, and also ammonium, it being possible in this case, if desired, for one to four hydrogen atoms to be replaced by C₁-C₄-alkyl, hydroxy-C₁-C₄-alkyl, C₁-C₄-alkoxy-C₃-C₄-alkyl, hydroxy-C₁-C₄-alkoxy-C₁-C₄-alkyl, phenyl or benzyl, preferably ammonium, dimethylammonium, diisopropylammonium, tetramethylammonium, tetrabutylammonium, 2-(2-hydroxyeth-1-oxy)eth-1-yl ammonium, di(2-hydroxyeth-1-yl)ammonium, trimethylbenzylammonium, furthermore phosphonium ions, sulfonium ions, preferably tri(C₁-C₄-alkyl)sulfonium and sulfoxonium ions, preferably, tri(C₁-C₄-alkyl)sulfoxonium.

Anions of suitable acid addition salts are mainly chloride, bromide, fluoride, hydrogen sulfate, sulfate, dihydrogen phosphate, hydrogen phosphate, nitrate, hydrogen carbonate, carbonate, hexafluorosilicate, hexafluorophosphate, benzoate and the anions of C₁-C₄-alkanoic acids, preferably formate, acetate, propionate and butyrate.

The safeners may also exist in form of their environmentally compatible esters. Suitable esters are alkyl-, alkoxyalkyl-, allyl-, propargyl- and oxetan-3-ylesters, preferably C₁-C₁₀ alkylesters, for example methyl-, ethyl-, propyl-, isopropyl-, butyl-, isobutyl-, pentyl-, mexyl-(1-ethyl-hexyl-) or isooctyl-(2-ethylhexyl-)esters, C₁-C₄-alkoxyethylesters, for example methoxyethyl-, ethoxyethyl- or butoxyethylesters, allylesters, propargylesters and oxetan-3-ylesters.

As a rule the ethyl esters of isoxadifen, mefenpyr and fenchlorazol are preferred.

Preferred with regard to the synergistic herbicidal action of the mixtures according to the invention are those 3-heterocyclyl-substituted benzoyl derivatives of the formula I in which the variables have the following meanings, either alone or in combination:

-   R¹ halogen such as chlorine or bromine, C₁-C₆-alkyl such as methyl     or ethyl or C₁-C₆-alkylsulfonyl such as methylsulfonyl or     ethylsulfonyl; especially preferably chlorine, methyl or     methylsulfonyl; -   R² a heterocyclic radical selected from the group: isoxazol-3-yl,     isoxazol-5-yl and 4,5-dihydroisoxazol-3-yl, it being possible for     the three radicals mentioned to be unsubstituted or mono- or     polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,     C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio; especially     preferably isoxazol-5-yl, 3-methyl-isoxazol-5-yl,     4,5-dihydroisoxazol-3-yl, 5-methyl-4,5-dihydroisoxazol-yl, 5-S     ethyl-4,5-dihydroisoxazol-3-yl or     4,5-dimethyl-4,5-dihydroisoxazol-3-yl; -   R³ halogen such as chlorine or bromine or C₁-C₆-alkylsulfonyl such     as methylsulfonyl or ethylsulfonyl; especially preferably chlorine,     methylsulfonyl or ethylsulfonyl; R⁴ hydrogen or methyl; especially     preferably hydrogen; -   R⁵ is C₁-C₆-alkyl, such as methyl, ethyl, propyl, 1-methylethyl,     butyl, 1-methylpropyl or 2-methylpropyl; especially preferably     methyl, ethyl or 1-methylethyl; -   R⁶ hydrogen or C₁-C₆-alkyl, such as methyl or ethyl; especially     preferably hydrogen or methyl.

Very particularly preferred are those 3-heterocyclyl-substituted benzoyl derivatives of the formula Ia, in particular the compounds Ia.1 to Ia.47, which are mentioned in Table 1 which TABLE 1 I

No. R¹ R² R³ R⁴ R⁵ R⁶ Ia.1 Cl 4,5-dihydroisoxazol-3-yl SO₂CH₃ H CH₃ CH₃ Ia.2 Cl 4,5-dihydroisoxazol-3-yl Cl H CH₃ CH₃ Ia.3 Cl 4,5-dihydroisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.4 Cl 4,5-dihydro-5-methylisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.5 Cl 4,5-dihydro-5,5-dimethylisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.6 Cl 4,5-dihydro-5-ethylisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.7 Cl 4,5-dihydro-5,5-diethylisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.8 Cl 4,5-dihydro-5-chloromethylisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.9 Cl 4,5-dihydro-5-ethoxyisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.10 Cl 4,5-dihydro-5-methoxyisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.11 Cl 4,5-dihydro-4,5-dimethylisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.12 Cl 4,5-dihydro-5-thioethylisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.13 Cl 4,5-dihydro-5-trifluoromethylisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.14 Cl 4,5-dihydroisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.15 Cl 4,5-dihydroisoxazol-3-yl Cl H C₂H₅ H Ia.16 Cl 4,5-dihydro-5-methylisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.17 Cl 4,5-dihydro-5,5-dimethylisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.18 Cl 4,5-dihydro-5-ethylisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.19 Cl 4,5-dihydro-5,5-diethylisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.20 Cl 4,5-dihydro-5-chloromethylisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.21 Cl 4,5-dihydroisoxazol-3-yl SOCH₃ H C₂H₅ H Ia.22 Cl 4,5-dihydro-5-ethoxyisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.23 Cl 4,5-dihydro-4,5-dimethylisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.24 Cl 4,5-dihydro-5-thioethylisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.25 Cl 4,5-dihydro-5-trifluoromethylisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.26 Cl 4,5-dihydroisoxazol-3-yl SO₂CH₃ H i-C₄H₉ H Ia.27 CH₃ 4,5-dihydroisoxazol-3-yl SO₂CH₃ H CH₃ CH₃ Ia.28 CH₃ 4,5-dihydroisoxazol-3-yl Cl H CH₃ CH₃ Ia.29 CH₃ 4,5-dihydroisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.30 CH₃ 4,5-dihydro-5-methylisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.31 CH₃ 4,5-dihydro-5,5-dimethylisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.32 CH₃ 4,5-dihydro-5-ethylisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.33 CH₃ 4,5-dihydro-5,5-diethylisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.34 CH₃ 4,5-dihydroisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.35 CH₃ 4,5-dihydro-4,5-dimethylisoxazol-3-yl SO₂CH₃ H CH₃ H Ia.36 CH₃ 4,5-dihydroisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.37 CH₃ 4,5-dihydroisoxazol-3-yl Cl H C₂H₅ H Ia.38 CH₃ 4,5-dihydro-5-methylisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.39 CH₃ 4,5-dihydro-5,5-dimethylisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.40 CH₃ 4,5-dihydro-5-ethylisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.41 CH₃ 4,5-dihydro-5,5-diethylisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.42 CH₃ 4,5-dihydro-4,5-dimethylisoxazol-3-yl SO₂CH₃ H C₂H₅ H Ia.43 CH₃ 4,5-dihydroisoxazol-3-yl SO₂CH₃ H i-C₄H₉ H Ia.44 Cl 3-methylisoxazol-5-yl SO₂CH₃ H CH₃ H Ia.45 Cl 3-methylisoxazol-5-yl SO₂CH₃ H C₂H₅ H Ia.46 CH₃ 3-methylisoxazol-5-yl SO₂CH₃ H CH₃ H Ia.47 CH₃ 3-methylisoxazol-5-yl SO₂CH₃ H C₂H₅ H

Also very particularly preferred are the compounds Ib, in particular the compounds Ib.1 to Ib.47, which differ from the compounds Ia.1 to Ia.47 only by the fact that they are present as the sodium salt:

Also very particularly preferred are the compounds Ic, in particular the compounds Ic.1 to Ic.47, which differ from the compounds Ia.1 to Ia.47 only by the fact that they are present as the lithium salt:

Also very particularly preferred are the compounds Id, in particular the compounds Id.1 to Id.47, which differ from the compounds Ia.1 to Ia.47 only by the fact that they are present as the potassium salt:

Also very particularly preferred are the compounds Ie, in particular the compounds Ie.1 to Ie.47, which differ from the compounds Ia.1 to Ia.47 only by the fact that they are present as the ammonium salt:

Very particularly preferred are, especially, the compounds Ia, especially the compounds Ia.1 to Ia.47.

Very particularly preferred are, moreover, the 3-heterocyclyl-substituted benzoyl derivatives of the formula I, where

-   -   R⁴ is hydrogen.

Very particularly preferred are, moreover, the 3-heterocyclyl substituted benzoyl derivatives of the formula I where

-   -   R² is a heterocyclic radical selected from the group:         isoxazol-3-yl, isoxazol-4-yl and isoxazol-5-yl, it being         possible for the three radicals mentioned to be unsubstituted or         mono- or polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,         C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio.

Very particularly preferred are, especially, the 3-heterocyclyl-substituted benzoyl derivatives of the formula I, where

-   -   R² is isoxazol-3-yl which can be unsubstituted or mono- or         polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,         C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio;     -   R⁴ is hydrogen.

Very particularly preferred are also, especially, the 3-heterocyclyl-substituted benzoyl derivatives of the formula I where

-   -   R² is isoxazol-5-yl, which can be unsubstituted or mono- or         polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,         C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio;     -   R⁴ is hydrogen.

Most particularly preferred is 4-[2-chloro-3-(3-methyl-isoxazol-5-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole.

Most particularly preferred is also 4-[2-methyl-3-(3-methyl-isoxazol-5-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole.

Very particularly preferred are, moreover, the 3-heterocyclyl-substituted benzoyl derivatives of the formula I where

-   -   R² is a heterocyclic radical selected from the group:         4,5-dihydroisoxazol-3-yl, 4,5-dihydroisoxazol-4-yl and         4,5-dihydroisoxazol-5-yl, it being possible for the three         radicals mentioned to be unsubstituted or mono- or         polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,         C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio.

Very particularly preferred are, especially, the 3-heterocyclyl-substituted benzoyl derivatives of the formula I where

-   -   R² is 4,5-dihydroisoxazol-3-yl which can be unsubstituted or         mono- or polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,         C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio;     -   R⁴ is hydrogen.

Most particularly preferred are the 3-heterocyclyl-substituted benzoyl derivatives of the formula I where

-   -   R¹ is halogen or C₁-C₆-alkyl; and     -   R² is 4,5-dihydroisoxazol-3-yl which can be unsubstituted or         mono- or polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy,         C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio;     -   R³ is C₁-C₆-alkylsulfonyl;     -   R⁴ is hydrogen.

Most especially preferred is −4-[2-chloro-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonylbenzoyl]-1-methyl-5-hydroxy-1H-pyrazole.

Most particularly preferred is also 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole.

In a further particular embodiment, the synergistic herbicidal mixture comprises, two herbicidal active compounds, a compound of formula I (component A) and the compound of formula II (component B).

For particular preferred embodiments, the respective preferences described above apply analogously.

In particular the synergistic herbicidal mixture comprises as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole and as component B the compound of formula II.

In a further particular embodiment, the synergistic herbicidal mixture comprises, at least three herbicidal active compounds, a compound of formula I (component A), the compound of formula II (component B) and

-   -   C) at least one herbicidal compound from the group of the         acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase         inhibitors (ALS), amides, auxin herbicides, auxin transport         inhibitors, carotenoid biosynthesis inhibitors,         enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS),         glutamine synthetase inhibitors, lipid biosynthesis inhibitors,         mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors,         photosynthesis inhibitors, synergists, growth substances, cell         wall biosynthesis inhibitors and a variety of other herbicides.

For particular preferred embodiments, the respective preferences described above apply analogously.

With a view to the synergistic herbicidal action of the mixtures comprising a component A), B) and C) according to the invention, compounds from amongst groups C1 to C14 or C16, preferably from amongst groups C2, C6 and C12, especially from amongst groups C6 and C12, are preferred as component C).

In particular, compounds from amongst the classes of active ingredients mentioned below are preferred, or the following compounds are very particularly preferred:

C1 acetyl-CoA carboxylase inhibitors (ACC)

-   -   cyclohexenone oxime ethers, in particular cycloxydim, sethoxydim         or tralkoxydim, preferably sethoxydim or tralkoxydim; or     -   phenoxyphenoxypropionic esters, in particular         clodinafop-propargyl (and, if appropriate, cloquintocet),         fenoxaprop-ethyl or fenoxaprop-P-ethyl, preferably         clodinafop-propargyl (and, if appropriate, cloquintocet) or         fenoxaprop-P-ethyl;

C2 acetolactate synthase inhibitors (ALS):

-   -   imidazolinones, in particular imazapyr, imazaquin,         imazamethabenz, imazethapyr or imazamoc, preferably imazapyr;     -   pyrimidyl ethers, in particular pyrithiobac sodium;     -   sulfonamides, in particular florasulam, flumetsulam or         metosulam, preferably metosulam; or     -   sulfonylureas, in particular halosulfuron-methyl, nicosulfuron,         primisulfuron-methyl, prosulfuron, rimsulfuron,         thifensulfuron-methyl, tribenuron-methyl,         N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide,         iodosulfuron or sulfosulfuron; especially halosulfuron-methyl,         nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron,         thifensulfuron-methyl tribenuron-methyl,         N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]-carbonyl]-2-(trifluoromethyl)-benzenesulfonamide         or sulfosulfuron;

C3 amides:

-   -   fluthiamide;

C4 auxin herbicides:

-   -   pyridinecarboxylic acids, in particular clopyralid; or     -   2,4-D;

C5 auxin transport inhibitors:

-   -   diflufenzopyr;

C6 carotenoid biosynthesis inhibitors:

-   -   isoxaflutole, mesotrione, isoxachloride, ketospiradox or         sulcotrione (chlormesulone), in particular isoxaflutole or         sulcotrione;

C7 enolpyruvylshikimate-3-phosphate synthase inhibitors (EPSPS):

-   -   glyphosate or sulfosate;

C8 glutamin synthetase inhibitors:

-   -   glufosinate-ammonium;

C9 lipid biosynthesis inhibitors:

-   -   chloroacetanilides, in particular dimethenamid, S-dimethenamid,         acetochlor, metolachlor or S-metolachlor,     -   thioureas, in particular benthiocarb;

C10 mitosis inihibitors:

-   -   dinitroanilines, in particular pendimethalin;

C11 protoporphyrinogen IX oxidase inhibitors:

-   -   diphenyl ethers, in particular acifluorfen or         acifluorfen-sodium;     -   oxadiazoles, in particular oxadiargyl; or     -   cyclic imides, in particular butafenacil, carfentrazone-ethyl,         cinidon-ethyl or flumiclorac-pentyl, preferably         carfentrazone-ethyl, cinidon-ethyl or flumidorac-pentyl;     -   pyrazoles, in particular JV 85;

C12 photosynthesis inhibitors:

-   -   pyridate or pyridafol, in particular pyridate;     -   benzothiadiazinones, in particular bentazone;     -   dipyridylenes, in particular paraquat-dichloride;     -   ureas, in particular diuron or isoproturon, preferably diuron;     -   phenols, in particular bromoxynil;     -   chloridazone;     -   triazines, in particular atrazine or terbutylazine; or     -   triazinones, in particular metribuzin;

C13 synergists:

-   -   oxiranes, in particular tridiphane;

C14 growth substances:

-   -   aryloxyalkanoic acids, in particular fluoroxypyr, MCPA or         mecoprop-P;     -   benzoic acids, in particular dicamba; or     -   quinolinecarboxylic acids, in particular quinclorac;

C16 various other herbicides:

-   -   triaziflam.

In particular, compounds from amongst the classes of active ingredients mentioned below are preferred, or the following—compounds are very particularly preferred.

C2 acetolactate synthase inhibitors (ALS):

-   -   imidazolinones, in particular imazapyr, imazaquin,         imazamethabenz, imazethapyr or imazamoc, preferably imazapyr;     -   pyrimidyl ethers, in particular pyrithiobac sodium;     -   sulfonamides, in particular florasulam, flumetsulam or         metosulam, preferably metosulam; or     -   sulfonylureas, in particular halosulfuron-methyl, nicosulfuron,         primisulfuron-methyl, prosulfuron, rimsulfuron,         thifensulfuron-methyl, tribenuron-methyl,         N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide,         iodosulfuron or sulfosulfuron; especially halosulfuron-methyl,         nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron,         thifensulfuron-methyl, tribenuron-methyl,         N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfon-amide         or sulfo-sulfuron;

C6 carotenoid biosynthesis inhibitors:

-   -   isoxaflutole or sulcotrione, preferably isoxaflutole;

C12 photosynthesis inhibitors:

-   -   pyridate;     -   benzothiadiazinones, in particular bentazone;     -   dipyridylenes, in particular paraquat-dichloride;     -   ureas, in particular diuron or isoproturon, preferably diuron;     -   phenols, in particular bromoxynil;     -   chloridazon;     -   triazines, in particular atrazine or terbutylazine; or     -   triazinones, in particular metribuzin;

Preferably compounds from amongst the classes C6 and C12 as mentioned above are preferred.

Especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II and as component C a sulfonylurea, in particular iodosulfuron.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II and as component C isoxaflutole.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II and as component C pyridate.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II and as component C a benzothiadiazinones, in particular bentazone.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II and as component C a triazine, in particular atrazine.

In a further particular embodiment, the synergistic herbicidal mixture comprises, at least two herbicidal active compounds, a compound of formula I (component A), the compound of formula II (component B) and

-   -   D) a safening effective amount of at least one safener selected         from the group of isoxadifen, mefenpyr and fenchlorazol.

Especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-s-hydroxy-1H-pyrazole, as component B the compound of formula II and as component D isoxadifen.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II and as component D mefenpyr.

Also especially preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II and as component D fenchlorazol.

In a further particular embodiment, the synergistic herbicidal mixture comprises, at least three herbicidal active compounds, a compound of formula I (component A), the compound of formula II (component B) and

-   -   C) at least one herbicidal compound from the group of the         acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase         inhibitors (ALS), amides, auxin herbicides, auxin transport         inhibitors, carotenoid biosynthesis inhibitors,         enolpyruvylshikimate 3-phosphate synthase inhibitors (BPSPS),         glutamine synthetase inhibitors, lipid biosynthesis inhibitors,         mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors,         photosynthesis inhibitors, synergists, growth substances, cell         wall biosynthesis inhibitors and a variety of other herbicides;         and     -   D) a safening effective amount of at least one safener selected         from the group of isoxadifen, mefenpyr and fenchlorazol.

With a view to the synergistic herbicidal action of the mixtures comprising a component A), B), C) and D) according to the invention, compounds from amongst groups C1 to C14 or C16, preferably from amongst groups C2, C6 and C12, especially from amongst groups C6 and C12, are preferred as component C).

In particular those of the above mentioned mixtures are preferred wherein the safener is isoxadifen.

Also those of the above mentioned mixtures are preferred wherein the safener is mefenpyr.

Also those of the above mentioned mixtures are preferred wherein the safener is fenchlorazol.

Especially those of the above mentioned mixtures are preferred wherein the component C) is selected from amongst the classes of active ingredients mentioned below, or the following compounds:

C2 acetolactate synthase inhibitors (ALS)

-   -   imidazolinones, in particular imazapyr, imazaquin,         imazamethabenz, imazethapyr or imazamoc, preferably imazapyr;     -   pyrimidyl ethers, in particular pyrithiobac sodium;     -   sulfonamides, in particular florasulam, flumetsulam or         metosulam, preferably metosulam; or     -   sulfonylureas, in particular halosulfuron-methyl, nicosulfuron,         primisulfuron-methyl, prosulfuron, rimsulfuron,         thifensulfuron-methyl, tribenuron-methyl,         N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide,         iodosulfuron or sulfosulfuron;

C6 carotenoid biosynthesis inhibitors:

-   -   isoxaflutole or sulcotrione, preferably isoxaflutole;

C12 photosynthesis inhibitors:

-   -   pyridate;     -   benzothiadiazinones, in particular bentazone;     -   dipyridylenes, in particular paraquat-dichloride;     -   ureas, in particular diuron or isoproturon, preferably diuron;     -   phenols, in particular bromoxynil;     -   chloridazon;     -   triazines, in particular atrazine or terbutylazine; or     -   triazinones, in particular metribuzin.

Extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C a sulfonylurea, in particular halosulfuron-methyl, nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron, thifensulfuron-methyl, tribenuron-methyl, N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]-carbonyl]-2-(trifluoromethyl)-benzenesulfonamide, iodo-sulfuron or sulfosulfuron, and as component D isoxadifen.

In particular extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C iodosulfuron and as component D isoxadifen.

Also extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C a sulfonylurea, in particular halosulfuron-methyl, nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron, thifensulfuron-methyl, tribenuron-methyl, N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide, iodosulfuron or sulfosulfuron, and as component D mefenpyr.

Also extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C a sulfonylurea, in particular halosulfuron-methyl, nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron, thifensulfuron-methyl, tribenuron-methyl, N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide, iodosulfuron or sulfosulfuron, and as component D fenchlorazol.

In a further particular embodiment, the synergistic herbicidal mixture comprises, at least four herbicidal active compounds, a compound of formula I (component A), the compound of formula II (component B) and

-   -   C) at least two herbicidal compound from the group of the         acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase         inhibitors (ALS), amides, auxin herbicides, auxin transport         inhibitors, carotenoid biosynthesis inhibitors,         enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS),         glutamine synthetase inhibitors, lipid biosynthesis inhibitors,         mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors,         photosynthesis inhibitors, synergists, growth substances, cell         wall biosynthesis inhibitors and a variety of other herbicides;         and     -   D) a safening effective amount of at least one safener selected         from the group of isoxadifen, mefenpyr and fenchlorazol.

With a view to the synergistic herbicidal action of the mixtures comprising a component A), B), C) and D) according to the invention, compounds from amongst groups C1 to C14 or C16, preferably from amongst groups C2, C6 and C12, especially from amongst groups C6 and C12 are preferred as component C).

In particular those of the above mentioned mixtures are preferred wherein the safener is isoxadifen.

Also those of the above mentioned mixtures are preferred wherein the safener is mefenpyr.

Also those of the above mentioned mixtures are preferred wherein the safener is fenchlorazol.

Especially those of the above mentioned mixtures are preferred wherein the two herbicides of the component C) are selected from amongst the classes of active ingredients mentioned below, or the following compounds:

C2 acetolactate synthase inihihitors (ALS):

-   -   imidazolinones, in particular imazapyr, imazaquin,         imazamethabenz, imazethapyr or imazamoc, preferably imazapyr;     -   pyrimidyl ethers, in particular pyrithiobac sodium;     -   sulfonamides, in particular florasulam, flumetsulam or         metosulam, preferably metosulam; or     -   sulfonylureas, in particular halosulfuron-methyl, nicosulfuron,         primisulfuron-methyl, prosulfuron, rimsulfuron,         thifensulfuron-methyl, tribenuron-methyl,         N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide,         iodosulfuron or sulfosulfuron;

C6 carotenoid biosynthesis inhibitors:

-   -   isoxaflutole or sulcotrione, preferably isoxaflutole;         C12 photosynthesis inhibitors:     -   pyridate;     -   benzothiadiazinones, in particular bentazone;     -   dipyridylenes, in particular paraquat-dichloride;     -   ureas, in particular diuron or isoproturon, preferably diuron;     -   phenols, in particular-bromoxynil;     -   chloridazon;     -   triazines, in particular atrazine or terbutylazine; or     -   triazinones, in particular metribuzin.

Extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C a sulfonylurea, in particular halosulfuron-methyl, nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron, thifensulfuron-methyl, tribenuron-methyl, N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide, iodosulfuron or sulfosulfuron, and a triazine, in particular atrazine or terbutylazine, and as component D isoxadifen.

In particular extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C iodosulfuron and atrazine, and as component D isoxadifen.

Also in particular extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C iodosulfuron and pyridate, and as component D isoxadifen.

Also extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C a sulfonylurea, in particular halosulfuron-methyl, nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron, thifensulfuron-methyl, tribenuron-methyl, N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide, iodosulfuron or sulfosulfuron, and a benzothiadiazinone, in particular bentazone, and as component D isoxadifen.

In particular extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C iodosulfuron and bentazone, and as component D isoxadifen.

Extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C a sulfonylurea, in particular halosulfuron-methyl, nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron, thifensulfuron-methyl, tribenuron-methyl, N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide, iodosulfuron or sulfosulfuron, and a triazine, in particular atrazine or terbutylazine, and as component D mefenpyr.

Also extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C a sulfonylurea, in particular halosulfuron-methyl, nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron, thifensulfuron-methyl, tribenuron-methyl, N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide, iodosulfuron or sulfosulfuron, and pyridate, and as component D mefenpyr.

Also extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-H-pyrazole, as component B the compound of formula II, as component C a sulfonylurea, in particular halosulfuron-methyl, nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron, thifensulfuron-methyl, tribenuron-methyl, N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide, iodosulfuron or sulfosulfuron, and a benzothiadiazinone, in particular bentazone, and as component D mefenpyr.

Extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C a sulfonylurea, in particular halosulfuron-methyl, nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron, thifensulfuron-methyl, tribenuron-methyl, N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide, iodosulfuron or sulfosulfuron, and a triazine, in particular atrazine or terbutylazine, and as component D fenchlorazol.

Also extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C a sulfonylurea, in particular halosulfuron-methyl, nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron, thifensulfuron-methyl, tribenuron-methyl, is N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide, iodosulfuron or sulfosulfuron, and pyridate, and as component D fenchlorazol.

Also extraordinary preferred are synergistic herbicidal mixtures which comprise as component A 4-[2-methyl-3-(4,5-dihydrois-oxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B the compound of formula II, as component C a sulfonylurea, in particular halosulfuron-methyl, nicosulfuron, primisulfuron-methyl, prosulfuron, rimisulfuron; thifensulfuron-methyl, tribenuron-methyl, N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]-amino]carbonyl]-2-(trifluoromethyl)-benzenesulfonamide, iodosulfuron or sulfosulfuron, and a benzothiadiazinone, in particular bentazone, and as component D fenchlorazol.

The present invention also extends to herbicidal compositions which comprise a herbicidally active amount of a synergistic herbicidal mixture (comprising components A), B) and, if desired, C) and, if desired, D) as described above), at least one liquid and/or solid carrier and, if desired, at least one surfactant.

The herbicidal compositions and synergistic herbicidal mixtures according to the invention can effect very good control of broad-leaved weeds and grass weeds in crops such as maize, cereals, rice and soya without damaging the crop plants, an effect observed especially even at low rates of application.

Taking into consideration the variety of application method in question, the herbicidal compositions and synergistic herbicidal mixtures according to the invention can additionally be employed in a further number of crop plants for eliminating undesirable plants. Examples of suitable crops are the following: Allium cepa, Ananas comosus, Arachis hypogaea, Asparagus officinalis, Beta vulgaris ssp. altissima, Beta vulgaris ssp. rapa, Brassica napus var. napus, Brassica napus var. napobrassica, Brassica rapa var. silvestris, Camellia sinensis, Carthamus tinctorius, Carya illinoinensis, Citrus limon, Citrus sinensis, Coffea arabica (Coffea canephora, Coffea liberica), Cucumis sativus, Cynodon dactylon, Daucus carota, Elaeis guineensis, Fragaria vesca, Glycine max, Gossypium hirsutum, (Gossypium arboreum, Gossypium herbaceum, Gossypium vitifolium), Helianthus annuus, Hevea brasiliensis, Hordeum vulgare, Humulus lupulus, Ipomoea batatas, Juglans regia, Lens culinaris, Linum usitatissimum, Lycopersicon lycopersicum, Malus spp., Manihot esculenta, Medicago sativa, Musa spp., Nicotiana tabacum (N. rustica), Olea europaea, Oryza sativa, Phaseolus lunatus, Phaseolus vulgaris, Picea abies, Pinus spp., Pisum sativum, Prunus avium, Prunus persica, Pyrus communis, Ribes sylvestre, Ricinus communis, Saccharum officinarum, Secale cereale, Solanum tuberosum, Sorghum bicolor (s. vulgare), Theobroma cacao, Trifolium pratense, Triticum aestivum, Triticum durum, Vicia faba, Vitis vinifera und Zea mays.

Moreover, the herbicidal compositions and synergistic herbicidal mixtures according to the invention can also be used in crops which tolerate the action of herbicides due to breeding, including genetic engineering methods.

The mixtures according to the invention, or the herbicidal compositions comprising them, can be employed, for example, in the form of directly sprayable aqueous solutions, powders, suspensions, also highly-concentrated aqueous, oily or other suspensions or dispersions, emulsions, oil dispersions, pastes, dusts, materials for spreading or granules, by means of spraying, atomizing, dusting, spreading or pouring.

The use forms depend on the intended purposes; in any case, they should guarantee the finest possible distribution of the active ingredients according to the invention.

Suitable inert auxiliaries are mineral oil fractions of medium to high boiling point such as kerosene and diesel oil, furthermore coal tar oils and oils of vegetable or animal origin, aliphatic, cyclic and aromatic hydrocarbons, e.g. paraffins, tetrahydronaphthalene, alkylated naphthalenes and their derivatives, alkylated benzenes and their derivatives, alcohols such as methanol, ethanol, propanol, butanol and cyclohexanol, ketones such as cyclohexanone, strongly polar solvents, such as N-methylpyrrolidone and water.

Aqueous use forms can be prepared from emulsion concentrates, suspensions, pastes, wettable powders or water-dispersible granules by adding water. To prepare emulsions, pastes or oil dispersions, the substances, as such or dissolved in an oil or solvent, can be homogenized in water by means of wetting agent, tackifier, dispersant or emulsifier. However, it is also possible to prepare concentrates composed of active substance, wetting agent, tackifier, dispersant or emulsifier and, if appropriate, solvent or oil, and these concentrates are suitable for dilution with water.

Suitable surfactants are the alkali metal, alkaline earth metal and ammonium salts of aromatic sulfonic acids, e.g. ligno-, phenol-, naphthalene- and dibutylnaphthalenesulfonic acid, and of fatty acids, of alkyl- and alkylaryl sulfonates, of alkyl sulfates, lauryl ether sulfates and fatty alcohol sulfates, and salts of sulfated hexa-, hepta- and octadecanols, and of fatty alcohol glycol ether, condensates of sulfonated naphthalene and its derivatives with formaldehyde, condensates of naphthalene, or of the naphthalenesulfonic acids, with phenol and formaldehyde, polyoxyethylene octylphenyl ether, ethoxylated isooctyl-, octyl- or nonylphenol, alkylphenyl and tributylphenyl polyglycol ether, alkylaryl polyether alcohols, isotridecyl alcohol, fatty alcohol/ethylene oxide condensates, ethoxylated castor oil, polyoxyethylene alkyl ethers or polyoxypropylene alkyl ethers, lauryl alcohol polyglycol ether acetate, sorbitol esters, lignin-sulfite waste liquors or methylcellulose.

Powders, materials for spreading and dusts can be prepared by mixing or concomitantly grinding the synergistic herbicidal mixture or the individual active ingredients with a solid carrier.

Granules, e.g. coated granules, impregnated granules and homogeneous granules, can be prepared by binding the active ingredients to solid carriers. Solid carriers are mineral earths such as silicas, silica gels, silicates, talc, kaolin, limestone, lime, chalk, bole, loess, clay, dolomite, diatomaceous earth, calcium sulfate, magnesium sulfate, magnesium oxide, ground synthetic material, fertilizers such as ammonium sulfate, ammonium phosphate, ammonium nitrate, ureas and products of vegetable origin such as cereal meal, tree bark meal, wood meal and nutshell meal, cellulose powders or other solid carriers.

The concentrations of the mixtures according to the invention in the ready-to-use products can be varied within wide ranges. In general, the formulations comprise from 0.01 to 95% by weight, preferably 0.5 to 90% by weight, of the mixture according to the invention.

The components A) and B) and, if desired, C) and, if desired, D) can be formulated jointly, but also separately, and/or applied to the plants, their environment and/or seeds jointly or separately. It is preferable to apply the active ingredients simultaneously. However, it is also possible to apply them separately.

Moreover, it may be advantageous to apply the herbicidal compositions and synergistic herbicidal mixtures according to the invention, jointly or separately, with additional other crop protection agents, for example with pesticides or agents for controlling phytopathogenic fungi or bacteria. Also of interest is the miscibility with mineral salt solutions which are employed for treating nutritional and trace element deficiencies. Non-phytotoxic oils and oil concentrates can also be added.

The mixtures according to the invention and the herbicidal compositions can be applied pre- or post-emergence. If the active ingredients are less well tolerated by certain crop plants, application techniques may be used in which the herbicidal compositions are sprayed, with the aid of the spray apparatus, in such a way that they come into as little contact, if any, with the leaves of the sensitive crop plants while reaching the leaves of undesirable plants which grow underneath, or the bare soil (post-directed, lay-by).

In the case of a post-emergence treatment of the plants, the herbicidal compositions according to the invention are preferably applied by foliar application. Application may be effected, for example, by usual spraying techniques with water as the carrier, using amounts of spray mixture of approx. 100 to 1000 l/ha. The compositions may also be applied by the so-called “low-volume” and “ultra-low-volume” methods, or in the form of so-called granules.

As a rule, the synergistic herbicidal mixtures comprise components A), B) and, if desired, C) and, if desired, D) in such weight ratios that the synergistic effect takes place.

The ratios of component A) and B) in the mixture preferably range from 1:0.001 to 1:500, preferably from 1:0.01 to 1:100, particularly preferably from 1:0.1 to 1:50.

The ratios of components A) and C) in the mixture preferably range from 1:0.002 to 1:800, preferably from 1:0.003 to 1:250, particularly preferably from 1:0.003 to 1:160, especially preferably from 1:0.02 to 1:250, extraordinary preferably from 1:0.02 to 1:160.

The ratios of components A) and D) in the mixture preferably range from 1:0.002 to 1:800, preferably from 1:0.003 to 1:250, particularly preferably from 1:0.02 to 1:160.

The rate of application of pure synergistic herbicidal mixture, i.e. without formulation auxiliaries, amounts to 0.2 to 5000 g/ha, preferably 2 to 2000 g/ha, in particular 8 to 1000 g/ha, of active substance (a.s.), depending on the intended aim, the season, the target plants and growth stage.

The rate of application of 3-heterocyclyl-substituted benzoyl derivative of the formula I is 0.1 to 250 g/ha, as a rule 5 to 250 g/ha, preferably 10 to 150 g/ha, of active substance (a.s.).

The preferred rate of application of the compound of formula II is 0.1 to 250 g/ha, as a rule 1 to 120 g/ha, preferably 10 to 100 g/ha, of active substance (a.s.)

The preferred application rate of the active ingredients of the optional component C are compiled in Table 2. TABLE 2 Rate of application Component C Class of active ingredient Active ingredient (g/ha) C1 acetyl-CoA carboxylase inhibitors 25-400 cyclohexenone oxime ethers 100-400  cycloxydim 100-400  sethoxydim 100-400  tralkoxydim 100-400  phenoxyphenoxypropionic esters 25-300 clodinafpop-P-propargyl^(a) 25-100 fenoxaprop-ethyl 50-300 fenoxaprop-P-ethyl 25-150 C2 acetolactate synthase inhibitors (ALS) 0.1-800  imidazolinones 20-800 imazapyr 30-400 imazaquin 50-300 imazamethabenz 100-800  imazethapyr 30-150 Imazamox 20-120 pyrimidyl ethers  2-120 pyrithiobac-sodium  2-120 sulfonamides  1-225 florasulam 1-20 flumetsulam 25-225 metosulam 1-60 sulfonylureas 0.1-120  halosulfuron-methyl  5-120 nicosulfuron  1-120 primisulfuron-methyl 10-120 prosulfuron 10-120 rimsulfuron  5-120 thifensulfuron-methyl 10-60  tribenuron-methyl 10-60  N-[[[4-methoxy-6-(trifluoromethyl)-  5-120 1,3,5-triazin-2-yl]amino]carbonyl]-2- (trifluoromethyl)benzenesulfonamide iodosulfuron 0.1-10   sulfosulfuron 10-60  C3 amides 250-2000 — fluthiamide 250-2000 C4 auxin herbicides 25-750 pyridinecarboxylic acids 25-750 clopyralid 25-750 — 2,4-D 50-750 C5 auxin transport inhibitors 15-100 — diflufenzopyr 15-100 C6 carotenoid biosynthesis inhibitors 25-600 — isoxaflutole 25-200 — sulcotrione 100-600  — mesotrione 25-300 — isoxachlortole 25-200 — ketospiradox 25-300 C7 enolpyruvylshikimat-3-phosphate 360-1080 synthase inhibitors (EPSPS) — glyphosate 360-1080 — sulfosate 360-1080 C8 glutamine synthetase inhibitors 10-600 — glufosinate-ammonium 10-600 C9 lipid biosynthesis inhibitors  60-4000 chloroacetanilides  60-4000 dimethenamid  60-2000 S-dimethenamid  60-2000 acetochlor 250-4000 metolachlor  60-4000 S-metolachlor  60-4000 thioureas 100-4000 benthiocarb 1000-4000  C10 mitosis inhibitors 375-3000 dinitroanilines 375-3000 pendimethalin 375-3000 C11 protoporphyrinogen IX oxidase 0.5-600  inhibitors diphenyl ethers 50-300 acifluorfen 50-300 acifluorfen-sodium 50-300 oxadiazoles 50-600 oxadiargyl 50-600 cyclic imides 0.5-300  carfentrazone-ethyl 0.5-35   cinidon-ethyl 3-35 flumiclorac-pentyl 3-35 butafenacil  5-300 JV 485 50-300 C12 photosynthesis inhibitors  15-4000 — pyridate  30-1500 pyridafol  30-1000 benzothiadiazinones  30-1440 bentazone  30-1440 dipyridylenes 100-800  paraquat-dichloride 100-800  ureas 250-1600 diuron 250-1600 isoprotoron 250-1600 phenols 100-700  bromoxynil 100-700  chloridazon 500-4000 triazines  15-4000 atrazine  15-4000 terbutylazine 250-4000 triazinone 30-300 metribuzin 30-300 C13 synergists 500-1500 oxiranes 500-1500 tridiphane 500-1500 C14 growth substances  25-1200 aryloxyalkanoic acids  50-1200 fluoroxypyr 50-400 MCPA 400-1200 mecoprop-P 400-1200 benzoic acids 75-800 dicamba 75-800 quinolinecarboxylic acids 25-600 quinclorac 25-600 C16 various other herbicides — triaziflam 50-750 ^(a)If appropriate, 10-50 g/ha cloquintocet may also be added.

The preferred rate of application of the safener D is 0.1 to 500 g/ha. As a rule the application rate for isoxadifen is from 0.5 to 50 g/ha, for mefenpyr from 2 to 100 g/ha and for fenchlorazol from 2 to 100 g/ha.

USE EXAMPLES

The mixtures according to the invention were applied pre- and/or post-emergence (foliar treatment). The herbicidal compounds of component B) and, if desired, of component C) as well as the safener D) were applied in the formulation in which they are present as commercially available product (s).

The herbicidally active compounds of components A), B) and, if desired, C), and, if desired D), were applied in succession or jointly, in the latter case in some cases as a tank mix and in some cases as a readymix, in the form of emulsions, aqueous solutions or suspensions, the vehicle being water (300-400 l/ha). In the case of the field trials, application was effected with the aid of a mobile plot sprayer.

The test period extended over 3 to 8 weeks, and the stands were also observed at later points in time.

Damage by the herbicidal compositions was evaluated with reference to a scale of 0% to 100% in comparison with untreated control plots. 0 means no damage and 100 means complete destruction of the plants.

The following examples will demonstrate, the action of the herbicidal compositions which can be used according to the invention, without excluding the possibility of other uses.

In these examples, the value B at which only an additive effect of the individual active ingredients is to be expected was calculated by the method of S. R. Colby (Calculating synergistic and antagonistic responses of herbicide combinations, Weeds 15, 20 pp (1967)). This was done using the formula $E = {X + Y - \frac{XY}{100}}$ where

-   X=Percentage of the herbicidal action of component A) at an     application rate of a; -   Y=Percentage of the herbicidal action of component B), and, if     desired, C), and, if desired, D) at an application rate of b, and,     if desired, c, and, if desired, d; -   E=expected herbicidal action of component A)+B), and, if desired C),     and; if desired, D) at rates of application a+b, and, if desired, c     and, if desired, d (in %).

If the value observed exceeds the value E calculated in accordance with Colby's formula, then synergism is present.

The herbicidal mixtures according to the invention exert a greater herbicidal action than would have been expected according to Colby on the basis of the observed effects of the individual components when used alone.

The results of the tests are shown in Tables 3 to 15 below.

In these studies, the following plants were used: Scientific name Common name Abutilon theophrasti Velvetleaf Amaranthus retroflexus Pigweed Avena fatua Wild oat Bidens pilosa Hairy beggarticks Brachiaria plantaginea Alexandergrass Commelina benghalensis Bengal Commelina Galium aparine Catchweed Pharbitis purpurea Common morningglory Polygonum persicaria Ladysthumb

TABLE 3 Herbicidal action of compound 1a.29 and compound II (post-emergence treatment; greenhouse) Avena Application fatua Pharbitis rate Damage Colby purpurea Colby [g/ha ai] [%] Value E Damage [%] Value E Ia.29 3.91 50 — 70 — Compound II 1.95 50 — 80 — Ia.29 + 3.91 + 1.95 80 75 98 94 Compound II

TABLE 4 Herbicidal action of compound 1a.29 and compound II (post-emergence treatment; greenhouse) Avena Application fatua Abutilon rate Damage Colby theophrasti Colby [g/ha ai] [%] Value E Damage [%] Value E Ia.29 1.95 25 — 40 — Compound II 0.98 30 — 30 — Ia.29 + 1.95 + 0.98 70 48 80 58 Compound II

TABLE 5 Herbicidal action of compound 1a.29, compound II and atrazine (post- emergence treatment; field) Application Commelina rate benghalensis Colby [g/ha ai] Damage [%] Value E Ia.29 7.81 40 — Compound II + Atrazine 3.91 + 62.5 60 — Ia.29 + Compound 7.81 + 3.91 + 62.5 85 76 II + Atrazine

TABLE 6 Herbicidal action of compound 1a.29, compound II and atrazine (post-emergence treatment; greenhouse) Application Abutilon Amaranthus rate theophrasti Colby retroflexus Colby [g/ha ai] Damage [%] Value E Damage [%] Value E Ia.29 3.91 80 — 60 — Compound II + Atrazine 1.95 + 31.3 50 — 85 — Ia.29 + 3.91 + 1.95 + 31.3 100 90 98 94 Compound II + Atrazine

TABLE 7 Herbicidal action of compound 1a.29, compound II and atrazine (post- emergence treatment; field) Application Bidens rate pilosa Colby [g/ha ai] Damage [%] Value E Ia.29 3.91 30 — Compound II + Atrazine 1.95 + 31.3 50 — Ia.29 + Compound 3.91 + 1.95 + 31.3 80 65 II + Atrazine

TABLE 8 Herbicidal action of compound 1a.29, compound II and atrazine (post-emergence treatment; greenhouse) Application Abutilon Amaranthus rate theophrasti Colby retroflexus Colby [g/ha ai] Damage [%] Value E Damage [%] Value E Ia.29 1.95 40 — 40 — Compound II + Atrazine 0.98 + 15.6 25 — 60 — Ia.29 + Compound 1.95 + 0.98 + 15.6 80 65 85 76 II + Atrazine

TABLE 9 Herbicidal action of compound 1a.29, compound II and bentazone (post- emergence treatment; field) Application Pharbitis rate purpurea Colby [g/ha ai] Damage [%] Value E Ia.29 3.91 70 — Compound II + Bentazone 1.95 + 62.5 60 — Ia.29 + Compound 3.91 + 1.95 + 62.5 98 88 II + Bentazone

TABLE 10 Herbicidal action of compound 1a.29, compound II and bentazone (post-emergence treatment; field) Application Polygonum rate persicaria Colby [g/ha ai] Damage [%] Value E Ia.29 1.95 95 — Compound II + Bentazone 0.98 + 31.3 70 — Ia.29 + Compound 1.95 + 0.98 + 31.3 100 99 II + Bentazone

TABLE 11 Herbicidal action of compound 1a.29, compound II and bentazone (post-emergence treatment; greenhouse) Application Abutilon Galium rate theophrasti Colby aparine Colby [g/ha ai] Damage [%] Value E Damage [%] Value E Ia.29 7.81 95 — 30 — Compound II + Bentazone 3.91 + 125 70 — 60 — Ia.29 + Compound 7.81 + 3.91 + 125 100 99 95 72 II + Bentazone

TABLE 12 Herbicidal action of compound 1a.29 and X* (post-emergence treatment; greenhouse) Application Abutilon Bidens rate theophrasti Colby pilosa Colby [g/ha ai] Damage [%] Value E Damage [%] Value E Ia.29 7.81 95 — 60 — X 3.91 50 — 70 — Ia.29 + X 7.81 + 3.91 100 98 95 88

TABLE 13 Herbicidal action of compound 1a.29, X* and atrazine (post-emergence treatment; field) Application Bidens rate pilosa Colby [g/ha ai] Damage [%] Value E Ia.29 7.81 60 — X + Atrazine 3.91 + 62.5 80 — Ia.29 + X + Atrazine 7.81 + 3.91 + 62.5 100 92

TABLE 14 Herbicidal action of compound 1a.29, X* and atrazine (post-emergence treatment; greenhouse) Application Abutilon Amaranthus rate theophrasti Colby retroflexus Colby [g/ha ai] Damage [%] Value E Damage [%] Value E Ia.29 3.91 80 — 60 — X + Atrazine 1.95 + 31.3 40 — 85 — Ia.29 + X + Atrazine 3.91 + 1.95 + 31.3 95 88 98 94

TABLE 15 Herbicidal action of compound 1a.29, X* and atrazine (post-emergence treatment; field) Application Brachiaria rate plantaginea Colby [g/ha ai] Damage [%] Value E Ia.29 3.91 80 — X + Atrazine 1.95 + 31.3 70 — Ia.29 + X + Atrazine 3.91 + 1.95 + 31.3 100 94 X* mixture of compound II, iodosulfuron and isoxadifen in a weigh ratio of 30:1:30 (= MaisTer

) 

1. A synergistic herbicidal mixture comprising A) at least one 3-heterocyclyl-substituted benzoyl derivative of the formula I

in which the variables have the following meanings: R¹, R³ are halogen, C₁-C₆-alkyl, C₁-C₆-haloalkyl, C₁-C₆-alkoxy, C₁-C₆-haloalkoxy, C₁-C₆-alkylthio, C₁-C₆-alkylsulfinyl or C₁-C₆-alkylsulfonyl; R² is a heterocyclic radical selected from the group: isoxazol-3-yl, isoxazol-4-yl, isoxazol-5-yl, 4,5-dihydroisoxazol-3-yl, 4,5-dihydroisoxazol-4-yl and 4,5-dihydroisoxazol-5-yl, it being possible for the six radicals mentioned to be unsubstituted or mono- or polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio; R⁴ is hydrogen, halogen or C₁-C₆-alkyl; R⁵ is C₁-C₆-alkyl; R⁶ is hydrogen or C₁-C₆-alkyl; or one of its environmentally compatible salts; and B) a synergistically effective amount of the compound of formula II

or one of its environmentally compatible salts; and, if desired, C) at least one herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides; and, if desired, D) a safening effective amount of at least one safener selected from the group of isoxadifen, mefenpyr and fenchlorazol; or one of its environmentally compatible salts or esters.
 2. A synergistic herbicidal mixture as claimed in claims 1, comprising, as component A), a 3-heterocyclyl-substituted benzoyl derivative of the formula I, where R⁴ is hydrogen.
 3. A synergistic herbicidal mixture as claimed in claim 2, comprising, as component A), a 3-heterocyclyl-substituted benzoyl derivative of the formula I, where R¹ is halogen, C₁-C₆-alkyl or C₁-C₆-alkylsulfonyl; R³ is halogen or C₁-C₆-alkylsulfonyl.
 4. A synergistic herbicidal mixture as claimed in claim 1, comprising, as component A), a 3-heterocyclyl-substituted benzoyl derivative of the formula 1, where R² is a heterocyclic radical selected from the group: isoxazol-3-yl, isoxazol-5-yl and 4,5-dihydroisoxazol-3-yl, it being possible for the three radicals mentioned to be unsubstituted or mono- or polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio.
 5. A synergistic herbicidal mixture as claimed in claim 4, comprising, as component A), a 3-heterocyclyl-substituted benzoyl derivative of the formula 1, where R² is isoxazol-5-yl, 3-methyl-isoxazol-5-yl, 4,5-dihydroisoxazol-3-yl, 5-methyl-4,5-dihydroisoxazol-3-yl, 5-ethyl-4,5-dihydroisoxazol-3-yl or 4,5-dimethyl-4,5-dihydroisoxazol-3-yl.
 6. A synergistic herbicidal mixture as claimed in claim 4, comprising, as component A), 4-[2-chloro-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole.
 7. A synergistic herbicidal mixture as claimed in claim 4, comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxazol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole.
 8. A synergistic herbicidal mixture comprising, A) at least one 3-heterocyclyl-substituted benzoyl derivative of the formula I

in which the variables have the following meanings: R¹, R³ are halogen. C₁-C₆-alkyl, C₁-C₆-haloalkyl. C₁-C₆-alkoxy, C₁-C₆-haloalkoxy, C₁-C₆-alkylthio, C₁-C₆-alkylsulfinyl or C₁-C₆-alkylsulfonyl; R² is a heterocyclic radical selected from the group: isoxazol-3-yl, isoxazol-4-yl, isoxazol-5-yl, 4,5-dihydroisoxazol-3-yl, 4,5-dihydroisoxazol-4-yl and 4,5-dihydroisoxazol-5-yl, it being possible for the six radicals mentioned to be unsubstituted or mono- or polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio; R⁴ is hydrogen, halogen or C₁-C₆-alkyl; R⁵ is C₁-C₆-alkyl; R⁶ is hydrogen or C₁-C₆ alkyl; or one of its environmentally compatible salts; and B) a synergistically effective amount of the compound of formula II

or one of its environmentally compatible salts.
 9. A synergistic herbicidal mixture as claimed in claim 8, comprising as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole and as component B) the compound of formula II.
 10. A synergistic herbicidal mixture as claimed in claim 8, further comprising component C C) at least one herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides.
 11. A synergistic herbicidal mixture as claimed in claim 110 comprising, as component C), at least one herbicidal compound from the groups C1 to C16: C1 acetyl-CoA carboxylase inhibitors (ACC): cyclohexenone oxime ethers, phenoxyphenoxypropionic esters or arylaminopropionic acids; C2 acetolactate synthase inhibitors (ALS): imidazolinones, pyrimidyl ethers, sulfonamides or sulfonylureas; C3 amides; C4 auxin herbicides: pyridinecarboxylic acids, 2,4-D or benazolin; C5 auxin transport inhibitors; C6 carotenoid biosynthesis inhibitors; C7 enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS); C8 glutamine synthetase inhibitors; C9 lipid biosynthesis inhibitors: anilides, chloroacetanilides, thioureas, benfuresate or perfluidone; C10 mitosis inhibitors: carbamates, dinitroanilines, pyridines, butamifos, chlorthal-dimethyl (DCPA) or maleic hydrazide; C11 protoporphyrinogen IX oxidase inhibitors: diphenyl ethers, oxadiazoles, cyclic imides or pyrazoles; C12 photosynthesis inhibitors: propanil, pyridate, pyridafol, benzothiadiazinones, dinitrophenols, dipyridylenes, ureas, phenols, chloridazon, triazines, triazinones, uracils or biscarbamates; C13 synergists: oxiranes; C14 growth substances: aryloxyalkanoic acids, benzoic acids or quinolinecarboxylic acids; C15 cell wall synthesis inhibitors: C16 various other herbicides: dichloropropionic acids, dihydrobenzofurans, phenylacetic acids or aziprotryn, barban, bensulide, benzthiazuron, benzofluor, buminafos, buthidazole, buturon, cafenstrole, chlorbufam, chlorofenprop-methyl, chloroxuron, cinmethylin, cumyluron, cycluron, cyprazine, cyprazole, dibenzyluron, dipropetryn, dymron, eglinazin-ethyl, endothall, ethiozin, flucabazone, fluorbentranil, flupoxam, isocarbamid, isopropalin, karbutilate, mefluidide, monuron, napropamide, napropanilide, nitralin, oxaciclomefone, phenisopham, piperophos, procyazine, profluralin, pyributicarb, secbumeton, sulfallate (CDEC), terbucarb, triazofenamide, triaziflam or trimeturon; or their environmentally compatible salts.
 12. A synergistic herbicidal mixture as claimed in claim 10, comprising, as component C), at least one herbicidal compound from the groups C1 to C16: C1 acetyl-CoA carboxylase inhibitors (ACC): cyclohexenone oxime ethers:  alloxydim, clethodim, cloproxydim, cycloxydim, sethoxydim, tralkoxydim, butroxydim, clefoxydim or tepraloxydim; phenoxyphenoxypropionic esters:  clodinafop-propargyl (and, if appropriate, cloquintocet), cyhalofop-butyl, diclofop-methyl, fenoxaprop-ethyl, fenoxaprop-P-ethyl, fenthiapropethyl, fluazifop-butyl, fluazifop-P-butyl, haloxyfop-ethoxyethyl, haloxyfop-methyl, haloxyfop-P-methyl, isoxapyrifop, propaquizafop, quizalofop-ethyl, quizalofop-P-ethyl or quizalofop-tefuryl; or arylaminopropionic acids:  flamprop-methyl or flamprop-isopropyl; C2 acetolactate synthase inhibitors (ALS): imidazolinones:  imazapyr, imazaquin, imazamethabenz-methyl(imazame), imazamoc, imazapic, imazethapyr or imazamethapyr; pyrimidyl ethers:  pyrithiobac-acid, pyrithiobac-sodium, bispyribac-sodium, KIH-6127 or pyribenzoxym; sulfonamides:  florasulam, flumetsulam or metosulam; or sulfonylureas:  amidosulfuron, azimsulfuron, bensulfuron-methyl, chlorimuron-ethyl, chlorsulfuron, cinosulfuron, cyclosulfamuron, ethametsulfuron-methyl, ethoxysulfuron, flazasulfuron, halosulfuron-methyl, imazosulfuron, metsulfuron-methyl, nicosulfuron, primisulfuron-methyl, prosulfuron, pyrazosulfuron-ethyl, rimsulfuron, sulfometuron-methyl, thifensulfuron-methyl, triasulfuron, tribenuron-methyl, triflusulfuron-methyl, N-[[[4-methoxy-6-(trifluoromethyl)-1,3,5-triazin-2-yl]amino]-carbonyl]-2-(trifluoromethyl)-benzenesulfonamide, sulfosulfuron or iodosulfuron; C3 amides: allidochlor (CDAA), benzoylprop-ethyl, bromobutide, chlorthiamid, diphenamid, etobenzanid (benzchlomet), fluthiamide, fosamin or monalide; C4 auxin herbicides: pyridine carboxylic acids: clopyralid or picloram; or 2,4-D or benazolin; C5 auxin transport inhibitors: naptalame or diflufenzopyr; C6 carotenoid biosynthesis inhibitors: benzofenap, clomazone (dimethazone), diflufenican, fluorochloridone, fluridone, pyrazolynate, pyrazoxyfen, isoxaflutole, isoxachlortole, mesotrione, sulcotrione (chlormesulone), ketospiradox, flurtamone, norflurazon or amitrol; C7 enolpyruvylshikimate-3-phosphate synthase inhibitors (EPSPS): glyphosate or sulfosate; C8 glutamine synthetase inhibitors: bilanafos (bialaphos) or glufosinate-ammonium; C9 lipid biosynthesis inhibitors: anilides:  anilofos or mefenacet; chloroacetanilides:  dimethenamid, S-dimethenamid, acetochlor, alachlor, butachlor, butenachlor, diethatyl-ethyl, dimethachlor, metazachlor, metolachlor, S-metolachlor, pretilachlor, propachlor, prynachlor, terbuchlor, thenylchlor or xylachlor; thioureas:  butylate, cycloate, di-allate, dimepiperate, EPTC, esprocarb, molinate, pebulate, prosulfocarb, thiobencarb (benthiocarb), tri-allate or vernolate; or benfuresate or perfluidone; C10 mitosis inhibitors: carbamates:  asulam, carbetamid, chlorpropham, orbencarb, pronamid (propyzamid), propham or tiocarbazil; dinitroanilines:  benefin, butralin, dinitramin, ethalfluralin, fluchloralin, oryzalin, pendimethalin, prodiamine or trifluralin; pyridines:  dithiopyr or thiazopyr; or butamifos, chlorthal-dimethyl (DCPA) or maleic hydrazide; C11 protoporphyrinogen IX oxidase inhibitors: diphenyl ethers:  acifluorfen, acifluorfen-sodium, aclonifen, bifenox, chlornitrofen (CNP), ethoxyfen, fluorodifen, fluoroglycofen-ethyl, fomesafen, furyloxyfen, lactofen, nitrofen, nitrofluorfen or oxyfluorfen; oxadiazoles:  oxadiargyl or oxadiazon; cyclic imides:  azafenidin, butafenacil, carfentrazone-ethyl, cinidon-ethyl, flumiclorac-pentyl, flumioxazin, flumipropyn, flupropacil, fluthiacet-methyl, sulfentrazone or thidiazimin; or pyrazoles:  ET-751, JV 485 or nipyraclofen; C12 photosynthesis inhibitors: propanil, pyridate or pyridafol; benzothiadiazinones:  bentazone; dinitrophenols:  bromofenoxim, dinoseb, dinoseb-acetate, dinoterb or DNOC; dipyridylenes:  cyperquat-chloride, difenzoquat-methylsulfate, diquat or paraquat-dichloride; ureas:  chlorbromuron, chlorotoluron, difenoxuron, dimefuron, diuron, ethidimuron, fenuron, fluometuron, isoproturon, isouron, linuron, methabenzthiazuron, methazole, metobenzuron, metoxuron, monolinuron, neburon, siduron or tebuthiuron; phenols:  bromoxynil or ioxynil; chloridazon; triazines:  ametryn, atrazine, cyanazine, desmetryn, dimethamethryn, hexazinone, prometon, prometryn, propazine, simazine, simetryn, terbumeton, terbutryn, terbutylazine or trietazine; triazinones:  metamitron or metribuzine; uracils:  bromacil, lenacil or terbacil; or biscarbamates:  desmedipham or phenmedipham; C13 synergists: oxiranes:  tridiphane; C14 growth substances: aryloxyalkanoic acids:  2,4-DB, clomeprop, dichlorprop, dichlorprop-P (2,4-DP-P), fluoroxypyr, MCPA, MCPB, mecoprop, mecoprop-P, or triclopyr; benzoic acids:  chloramben or dicamba; or quinolinecarboxylic acids:  quinclorac or quinmerac; C15 cell wall synthesis inhibitors: isoxaben or dichlobenil; C16 various other herbicides: dichloropropionic acids:  dalapon; dihydrobenzofurans:  ethofumesate; phenylacetic acids:  chlorfenac (fenac); or aziprotryn, barban, bensulide, benzthiazuron, benzo-fluor, buminafos, buthidazole, buturon, cafenstrole, chlorbufam, chlorfenprop-methyl, chloroxuron, cin-methylin, cumyluron, cycluron, cyprazine, cyprazole, dibenzyluron, dipropetryn, dymron, eglinazin-ethyl, endothall, ethiozin, flucabazone, fluorbentranil, flupoxam, isocarbamid, isopropalin, karbutilate, mefluidide, monuron, napropamide, napropanilide, nitralin, oxaciclomefone, phenisopham, piperophos, procyazine, profluralin, pyributicarb, secbumeton, sulfallate (CDEC), terbucarb, triazofenamid, triaziflan or trimeturon; or their environmentally compatible salts.
 13. A synergistic herbicidal mixture as claimed in claim 12, wherein at least one herbicidal compound of component C is from groups C2, C6 or C12.
 14. A synergistic herbicidal mixture as claimed in claim 11 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) the compound of formula II and as component C) a herbicidal compound from the group C2.
 15. A synergistic herbicidal mixture as claimed in claim 11 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) the compound of formula II and as component C) a herbicidal compound from the group C6.
 16. A synergistic herbicidal mixture as claimed in claim 10 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) the compound of formula II and as component C) isoxaflutole.
 17. A synergistic herbicidal mixture as claimed in claim 11 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) the compound of formula II and as component C) a herbicidal compound from the group C12.
 18. A synergistic herbicidal mixture as claimed in claim 12 comprising, as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) the compound of formula II and as component C) a triazine from group C12.
 19. A synergistic herbicidal mixture as claimed in claim 10, comprising as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) the compound of formula II and as component C) atrazine.
 20. A synergistic herbicidal mixture as claimed in claim 10, comprising as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) the compound of formula II and as component C) bentazone.
 21. A synergistic herbicidal mixture as claimed in claim 10, comprising as component A) 4-[2-methyl-3-(4,5-dihydroisoxa-zol-3-yl)-4-methylsulfonyl-benzoyl]-1-methyl-5-hydroxy-1H-pyrazole, as component B) the compound of formula II and as component C) pyridate.
 22. A synergistic herbicidal mixture as claimed in claim 8, further comprising component D D) a safening effective amount of at least one safener selected from the group of isoxadifen, mefenpyr and fenchlorazol.
 23. A synergistic herbicidal mixture as claimed in claim 22, further comprising component C C) at least one herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides; and
 24. A synergistic herbicidal mixture as claimed in claim 8, wherein component A) and B) are present in a weight ratio of 1:0.001 to 1:500.
 25. A synergistic herbicidal mixture as claimed in claim 10, wherein component A) and component C) are present in a weight ratio of 1:0.002 to 1:800.
 26. A synergistic herbicidal mixture as claimed in claim 22, wherein component A) and component D) are present in a weight ratio of 1:0.002 to 1:800.
 27. A herbicidal composition comprising a herbicidally active amount of a synergistic herbicidal mixture claim 1, and at least one inert liquid and/or solid carrier therefor.
 28. A process for preparing a herbicidal composition of claim 27, comprising mixing together component A); component B), if desired component C) if desired component D), and at least one inert liquid and/or solid carrier therefor.
 29. A method of controlling undesired vegetation, comprising applying simultaneously or separately to said vegetation, the environment of said vegetation and/or seeds of said vegetation A) at least one 3-heterocyclyl-substituted benzoyl derivative of the formula I

in which the variables have the following meanings: R¹, R³ are halogen, C₁-C₆-alkyl, C₁-C₆-haloalkyl, C₁-C₆-alkoxy, C₁-C₆-haloalkoxy, C₁-C₆-alkylthio, C₁-C₆-alkylsulfinyl or C₁-C₆-alkylsulfonyl; R² is a heterocyclic radical selected from the group: isoxazol-3-yl, isoxazol-4-yl, isoxazol-5-yl, 4,5-dihydroisoxazol-3-yl, 4,5-dihydroisoxazol-4-yl and 4,5-dihydroisoxazol-5-yl, it being possible for the six radicals mentioned to be unsubstituted or mono- or polysubstituted by halogen, C₁-C₄-alkyl, C₁-C₄-alkoxy, C₁-C₄-haloalkyl, C₁-C₄-haloalkoxy or C₁-C₄-alkylthio; R⁴ is hydrogen, halogen or C₁-C₆-alkyl; R⁵ is C₁-C₆-alkyl; R⁶ is hydrogen or C₁-C₆-alkyl; or one of its environmentally compatible salts; B) a synergistically effective amount of the compound of formula II

or one of its environmentally compatible salts; and, if desired, C) at least one herbicidal compound from the group of the acetyl-CoA carboxylase inhibitors (ACC), acetolactate synthase inhibitors (ALS), amides, auxin herbicides, auxin transport inhibitors, carotenoid biosynthesis inhibitors, enolpyruvylshikimate 3-phosphate synthase inhibitors (EPSPS), glutamine synthetase inhibitors, lipid biosynthesis inhibitors, mitosis inhibitors, protoporphyrinogen IX oxidase inhibitors, photosynthesis inhibitors, synergists, growth substances, cell wall biosynthesis inhibitors and a variety of other herbicides; and, if desired, D) a safening effective amount of at least one safener selected from the group of isoxadifen, mefenpyr and fenchlorazol; or one of its environmentally compatible salts or esters.
 30. The method of claim 29, wherein the undesired vegetation is proximate crop plants, and the leaves of the crop plants and of the undesired plants are treated.
 31. The method of claim 21, wherein at least two of component A), component B), if desired component C), and if desired component D are applied in the form of a mixture.
 32. The method of claim 29, wherein the component A), B), if desired C) and if desired D) are applied separately.
 33. The composition of claim 27, wherein the composition further comprises at least one surfactant. 